FSCR_SCV
fscr |= FSCR_SCV;
init_task.thread.fscr &= ~FSCR_SCV;
init_task.thread.fscr &= ~FSCR_SCV;
if (fscr & FSCR_SCV)
fscr &= ~FSCR_SCV; /* SCV must not be enabled */
if (cpu_has_feature(CPU_FTR_ARCH_300) && (current->thread.fscr & FSCR_SCV))
mtspr(SPRN_FSCR, mfspr(SPRN_FSCR) & ~FSCR_SCV);
if (cpu_has_feature(CPU_FTR_ARCH_300) && (current->thread.fscr & FSCR_SCV))
mtspr(SPRN_FSCR, mfspr(SPRN_FSCR) | FSCR_SCV);